package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
   @Resource
   private StringRedisTemplate stringRedisTemplate;
    @Autowired
    private UserMapper userMapper;

    /**
     * 发送手机验证码
     */
    @Override
    public Result sendCode(String phone, HttpSession session){
       // 1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
        //2.不符合返回错误信息
            return Result.fail("手机号格式错误！");
        }
        //3.符合生成验证码
        String code = RandomUtil.randomString(6);
        //4.保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+ phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码
        log.debug("发送短信验证码成功，验证码：{}",code);
        //返回ok
        return Result.ok();
    }
    /**
     * 登录功能
     * 登录参数，包含手机号、验证码；或者手机号、密码
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {

        // 0.校验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.不符合返回错误信息
            return Result.fail("手机号格式错误！");
        }
        //1.校验验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if(cacheCode != null && !cacheCode.equals(code)){
            //2.不符合返回错误信息
            return Result.fail("验证码错误！");
        }
        //3.符合根据手机查询用户是否存在select * from tb_user where phone=?
       User user=query().eq("phone", phone).one();
        //4.不存在创建新用户，保存到数据库
      if(user == null){
         user = createUserWithPhone(phone);
     }
        //5.用户存在保存在redis中
        String token = UUID.randomUUID().toString();
        //随机生成token
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        //将user对象转为hashmap存
        Map<String ,Object> userMap=BeanUtil.beanToMap(userDTO,new HashMap<>(),
        CopyOptions.create()
                .setIgnoreNullValue(true)
                .setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString()));
        //储存
        String tokenKey=LOGIN_CODE_KEY+token;
       stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_CODE_TTL, TimeUnit.MINUTES);
       //返回
      return Result.ok();
    }
        private User createUserWithPhone(String phone){
            //创建用户
            User user=new User();
            user.setPhone(phone);
            user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
            //保存用户
            save(user);
            return user;
        }
}
